21 results about "Anisotropic conductivity" patented technology

The invention belongs to the technical field of phase change materials, and particularly relates to flexible anisotropic conductive hydrated salt phase change gel as well as a preparation method and application thereof. The flexible anisotropic conductive hydrated salt phase change gel comprises hydrogel and hydrated salt adsorbed in a semi-interpenetrating three-dimensional network structure of the hydrogel, the hydrogel is prepared from the following raw materials in parts by weight: 1 to 15 parts of hydrophilic modified conductive filler, 4 to 15 parts of gel polymer, 1 to 7 parts of polysaccharide substance and 75 to 94 parts of water. The flexible anisotropic conductive hydrated salt phase change gel material disclosed by the invention has high phase change latent heat, high decomposition heat storage and anisotropic conductivity, can realize high-efficiency heat dissipation and temperature control through phase change at high temperature, and can be decomposed to absorb heat when thermal runaway occurs so as to inhibit generation and spreading of thermal runaway; at low temperature, the material can be electrified in one direction to heat the battery, and insulation can be maintained in the other direction, so that the full-temperature-range heat management of the lithium ion battery is realized, and the safety is improved.

The invention discloses an electroporation ablation voltage control method and system for a cardiovascular balloon. The method comprises the steps that original electric signals are collected for a balloon electrode, complex impedance information of each frequency point is extracted, and an impedance spectrum is obtained; converting the impedance spectrum into an equivalent conductivity tensor for describing anisotropic conductivity characteristics of the tissue; on the basis of the equivalent conductivity tensor, a corrected Poisson equation is adopted, and three-dimensional electric field distribution around the balloon is obtained and used for electric field prediction; based on an electric field prediction result and a feedback result in the impedance spectrum, a nonlinear dynamic regulation and control formula is established, and dynamic voltage output is controlled; and multi-physics field coupling is carried out to verify that the voltage output meets the safety and performance requirements. The system comprises a signal acquisition and impedance measurement module, an equivalent conductivity calculation and electric field prediction module, a voltage regulation and control and pulse generation module and a multi-mode feedback control module. Accurate voltage control in the electroporation ablation process can be achieved, and the uniformity and controllability of electric field distribution are improved.

This invention relates to the field of numerical modeling technology and discloses a method for calculating the anisotropic conductivity of carbon fiber composites based on the partial element equivalent circuit method. The method includes: establishing resistance, capacitance, and inductance matrices under the microstructure of the carbon fiber composite using the partial element equivalent circuit method; setting fiber contact points using the concept of fiber ripple and forming PEEC mesh nodes using these contact points; establishing the PEEC mesh and electric and magnetic field decoupling method under the microstructure of the carbon fiber composite; establishing the PEEC equation based on the established parameter matrix and overlap resistance, and adding excitation sources by identifying electrode positions; and calculating the anisotropic conductivity of the carbon fiber composite by solving the PEEC equation. This invention solves the problems of the inapplicability of finite element method and finite-difference time-domain mesh, the tendency for microstructure solutions to diverge, and the inapplicability of the full-wave electric network method.

The present invention discloses a magnetotelluric simulation method for an arbitrary anisotropic conductivity tensor in spherical coordinate system, belonging to the technical field of geophysical forward modeling, including: determining the coordinates and observation frequencies of a measuring point array; constructing an earth background model and discretizing it using unstructured tetrahedral meshes to obtain unstructured meshes; applying an arbitrary anisotropic conductivity tensor in spherical coordinates to assign electrical properties to the unstructured meshes; applying orthogonal non-planar wave field sources to the outer meshes of the unstructured meshes and calculating the source term integrals of the non-planar wave field sources; calculating the mass matrix and stiffness matrix of the elements in the unstructured meshes and forming the overall element matrix according to the numbering relationship; constructing a corresponding simulation equation set according to the overall element matrix and the source term integrals and at the current observation frequency; solving the simulation equation set to achieve magnetotelluric simulation, so as to solve the technical problem that the existing magnetotelluric simulation technology cannot flexibly simulate the magnetotelluric responses of arbitrarily anisotropic media at the intercontinental scale.

A layer of the mixture that contains polymer and conductive particles is applied over a first surface, when the mixture has a first viscosity that allows the conductive particles to rearrange within the layer. An electric field is applied over the layer, so that a number of the conductive particles are aligned with the field and thereafter the viscosity of the layer is changed to a second, higher viscosity, in order to mechanically stabilise the layer. This leads to a stable layer with enhanced and anisotropic conductivity.

The invention relates to the technical field of numerical modeling, and discloses a method for calculating anisotropic conductivity of a carbon fiber composite material based on a partial element equivalent circuit method, which comprises the following steps of: establishing a resistance matrix, a capacitance matrix and an inductance matrix under a microstructure of the carbon fiber composite material through the partial element equivalent circuit method; setting contact points of fibers by using a concept of fiber ripple degree, and forming grid nodes of PEEC by using the contact points; establishing a PEEC grid and an electric field and magnetic field decoupling method under the microscopic condition of the carbon fiber composite material; establishing a PEEC equation based on the established parameter matrix and the overlap resistance, and adding an excitation source by identifying the position of an electrode; calculating the anisotropic conductivity of the carbon fiber composite material by solving a PEEC equation; according to the method, the problems that finite elements and time domain finite difference grids are not applicable, microstructure solution is easy to diverge and full waves of an electrical network method are not applicable are solved.

The invention discloses an anisotropic conductive adhesive film as well as a preparation method and application thereof. The anisotropic conductive adhesive film is prepared from the following raw materials in parts by mass: 25 to 30 parts of polymer matrix; 0.1 to 1 part of crop fiber; 2-3 parts of a conductive filler; 20-40 parts of an insulating filler; 0.0001 to 0.0005 part of a cross-linking agent; the addition amount of aluminum acetate in the Al < 3 + > emulsion is 1-2 parts. The macroscopic reinforced structure of reinforced concrete and the microcosmic coordination bonding mechanism of mussel byssus are combined for the first time and used for designing the anisotropic conductive adhesive film, and long-term stability of a conductive / insulating structure is achieved. The anisotropic conductive adhesive film prepared by the invention not only has remarkable anisotropic conductivity (low resistance (about 1 ohm) in the vertical direction and high resistance (about 1.2 * 10 < 8 > ohm) in the horizontal direction), but also has high tensile strength (-5.2 MPa), high elongation at break (-354%), high stripping force (-900 gf / mm) and good low temperature resistance and self-repairing capability.

The application belongs to the technical field of electromagnetic prospecting and numerical simulation, and provides a three-dimensional forward simulation method and system for anisotropic medium of electromagnetic method with ultra-wide frequency band, which is based on the vector finite element method, discretizes the electric field equation of unified traditional current and displacement current, fully considers the influence of arbitrary anisotropic conductivity, arbitrary anisotropic dielectric constant and magnetic conductivity, and provides a basis for the theoretical research, field survey and data inversion of the electromagnetic method with ultra-wide frequency band.

The present invention discloses a method, device, and equipment for detecting antistatic, high-performance resin conduits. The method includes: multi-directional sampling of the conduits to obtain sets of raw and preprocessed splines; multi-wavelength Raman spectroscopy analysis; calculation of estimated conductivity and specific surface area; differential electrostatic charge injection; monitoring the charge dissipation process; and calculation of a comprehensive anisotropic conductivity index. The technical solution of the present invention can effectively detect and evaluate the conductivity of antistatic, high-performance resin conduits in different directions, ensuring comprehensive and balanced static dissipation in practical applications.

The application provides a method and system for adaptively and optimally selecting background field conductivity in electromagnetic field forward modeling of a horizontal well, wherein the method comprises the following steps: extracting characteristic parameters from a full-tensor anisotropic conductivity tensor of a target formation, and constructing a candidate background conductivity parameter set; calculating a difference spectral domain field corresponding to the candidate background conductivity parameters; performing convergence quantitative analysis on the difference spectral domain field, comprehensively evaluating and ranking each candidate background conductivity parameter based on a convergence evaluation index, and determining an optimal background conductivity parameter; and performing a background field subtraction operation by using the optimal background conductivity parameter to obtain a final calculation result. The method and system for adaptively and optimally selecting background field conductivity in electromagnetic field forward modeling of a horizontal well can automatically identify the optimal background conductivity parameter in formations with different anisotropic types and intensities, improve the convergence of the difference spectral domain field, and improve the electromagnetic field calculation efficiency.

The invention relates to the technical field of conductivity measurement of composite materials, and discloses an equivalent modeling method for characterizing anisotropic conductivity of a carbon fiber composite material, which comprises the following steps: enabling carbon fiber filaments to be equivalent to a conductive filament group, calculating the resistance of a single equivalent conductive filament according to the radius of each conductive filament in the conductive filament group, and calculating the anisotropic conductivity of the carbon fiber composite material according to the resistance of the equivalent conductive filament. A group of parallel vertical frameworks are used for fixing the conductive wire group; a resin-based area is replaced by an air medium area, the resin insulation effect is eliminated, in model setting, only air or vacuum passes through conductive wire groups, conductive pieces are added among a plurality of groups of conductive wires in the conductive wire groups, and lap resistance among carbon fiber wires is simulated. According to the invention, the resistance wire with limited volume is used for replacing the diameter micron-sized carbon fiber yarn, the problem that the micron-sized carbon fiber yarn cannot be controlled is solved, the air domain is used for replacing the resin domain, and the lap joint between the fibers is simulated through the lap joint ring, so that the problem that the lap joint resistance cannot be reached when the fibers are submerged in the resin matrix is solved.

The invention relates to the technical field of artificial intelligence robot sensor active materials, in particular to a conductive micro-nano fiber material prepared through airflow-assisted rotary spinning and application of the conductive micro-nano fiber material in a piezoresistive sensor. The conductive micro-nano fiber material is prepared by combining a unique airflow-assisted rotary spinning technology with a high-temperature carbonization process, centrifugal force and airflow perpendicular to a conveying belt are combined, and the density of precursor fibers is controlled through the stacking degree; the finally obtained conductive micro-nano fiber material has relatively good elasticity and anisotropic conductive performance, and can maintain relatively good piezoresistive performance in high-temperature and low-temperature extreme environments.

The utility model relates to a curved surface touch display device which comprises a display screen and a lens arranged on the front side of the display screen, the lens is formed by gathering a large number of optical fibers, the first end, close to the display screen, of each optical fiber forms the rear side face of the lens, and the second end, away from the display screen, of each optical fiber forms the front side face of the lens. The front side surface of the lens is a non-deployable curved surface; conductive wires are clamped between part of adjacent optical fibers, and the conductive wires form anisotropic conduction between the front side face and the rear side face of the lens. The capacitive touch screen is characterized in that the display screen is a touch display screen with a capacitive touch sensing layer, the capacitive touch sensing layer is a plastic film arranged on the display surface of the display screen, and the rear ends of the conductive wires are electrically coupled with the capacitive touch sensing layer. The curved surface touch display device can effectively reduce loss caused by the fact that light emitted by the display surface of the display screen enters non-corresponding adjacent optical fibers, so that a front display picture formed on the front side surface of the lens by the display screen is clearer.

The embodiment of the invention provides a stimulation intensity determination method of a target regulation cortex, computing equipment and a computer program product. The method for determining the stimulation intensity of the target regulation cortex comprises the following steps: acquiring a first movement threshold value of a primary movement cortex of a tested head by using a transcranial magnetic stimulation experiment; constructing an anisotropic conductivity head model corresponding to the tested head based on the magnetic resonance imaging data of the tested head; determining a first test area corresponding to the primary movement cortex and a second test area corresponding to the target regulation cortex in the anisotropic conductivity head model; respectively carrying out electric field simulation on the first test area and the second test area by utilizing a stimulation intensity value corresponding to the first motion threshold value; determining a scaling factor based on the first electric field value and the second electric field value; a target stimulation intensity of the target regulatory cortex is determined based on the scaling factor and the first motion threshold. According to the technical scheme provided by the embodiment of the invention, the more accurate target stimulation intensity of the target regulation cortex can be obtained.

The invention provides an eddy current nondestructive testing finite element analysis method for a woven carbon fiber composite material, and belongs to the technical field of carbon fiber composite material detection.The eddy current nondestructive testing finite element analysis method comprises the steps that the minimum basic unit size of finite element analysis of the woven carbon fiber composite material is obtained; measuring the impedance of the woven carbon fiber composite material in each direction and obtaining the conductivity of the minimum basic unit in each direction; arraying the weft basic module and the warp basic module to obtain a geometric model of the woven carbon fiber composite material; setting the conductivity of weft yarns and warp yarns in the geometric model of the woven carbon fiber composite material to obtain a finite element simulation model; establishing a coil model; performing grid division on the coil and the finite element simulation model; setting eddy current nondestructive testing field domain parameters, and carrying out finite element analysis on the woven carbon fiber composite material. According to the method, electromagnetic field distribution and eddy current detection simulation of the woven carbon fiber composite material can be realized, and the calculation efficiency is improved while the finite element simulation precision is met.

The invention provides a resistance acquisition method and device for a lightning protection material with anisotropic conductivity, and the method comprises the steps: measuring the resistance of a plurality of measurement points in any angle direction of a typical test piece of the lightning protection material on the surface of an aircraft, obtaining the resistivity and initial resistance of the lightning protection material on the surface of the aircraft in each angle direction, carrying out the function fitting through an n-order polynomial, and obtaining the resistance of the lightning protection material on the surface of the aircraft. According to the method, the relational expression of the resistance value of any point in the nonlinear area of the aircraft surface lightning protection material and the reference point is obtained, so that the lightning protection performance of the aircraft surface lightning protection material with anisotropic conductivity can be evaluated more accurately, guidance is provided for the electrical performance design of the aircraft surface, the method is simple to operate, and meanwhile, the method has good application prospects. A resistance calculation result can be used for compiling a model lap joint technical condition, giving a lap joint resistance allowable value of airborne equipment installed on a lightning protection material and a reference point, and guiding aircraft electric lap joint performance index formulation and detection.

The invention discloses a complex reservoir rock core electrical property evaluation method and system based on an orthotropic electrical theory, and relates to the technical field of oil and gas reservoir exploration theories and application, and the method comprises the following steps: constructing a complex reservoir rock core orthotropic electrical basic model, and determining the orthotropic expression form of conductivity and resistivity tensor; according to the method, an electrical theoretical model based on orthotropic conductivity tensor is constructed, a tensor expression form containing transverse conductivity and longitudinal conductivity is established, a corresponding resistivity tensor is derived, and the electrical resistivity of the current transformer is calculated through a Maxwell equation set and a generalized Laplacian equation. A control equation of a stable current field in the anisotropic medium is established, systematic description of the conduction rule of the current in the orthotropic medium is achieved, the limitation that a traditional method depends on isotropic hypothesis is overcome from the theoretical root, and a rigorous mathematical physical foundation is laid for accurate characterization of the electrical anisotropy of a complex reservoir core.

The invention relates to a red fluorescence anisotropic conductive film capable of preventing counterfeiting and encrypting information and a preparation technology thereof, and belongs to the technical field of fiber material preparation. The preparation method comprises the following five steps: (1) preparing Eu-MOF by a precipitation method; (2) preparing Pb-MOF by a precipitation method; (3) preparing polymethyl methacrylate (PMMA) by a bulk polymerization method; (4) preparing a spinning solution; and (5) preparing a [Pb-MOF / Eu-MOF / PMMA] / / [CNTs / PMMA] Janus fiber array film by a two-axis parallel electrospinning technology, wherein the array film is the red fluorescent anisotropic conductive film capable of preventing counterfeiting and encrypting information. The prepared red fluorescence anisotropic conductive film with the anti-counterfeiting and information encryption functions has good red fluorescence, anisotropic conductivity, anti-counterfeiting and information encryption functions. The preparation method disclosed by the invention is simple and easy to implement, batch production can be realized, and the novel fiber membrane material has a wide application prospect.

The present invention belongs to the field of geophysical exploration, and specifically relates to a parallel three-dimensional forward modeling method for complex media of airborne natural source electromagnetic method. It includes: S1: constructing a three-dimensional geological geometric model of the study area; S2: generating an unstructured tetrahedral grid of the model; S3: setting anisotropic conductivity tensor and magnetic permeability of the unstructured tetrahedral grid of the model; S4: constructing the frequency domain electric field control equation; S5: using vector finite element to discretize the electric field control equation; S6: setting boundary conditions; S7: solving finite element linear equations; S8: calculating the three components of electric field and magnetic field at the measuring point and base station; S9: calculating the impedance, apparent resistivity, phase, and dipole data at the measuring point. The present invention provides a three-dimensional forward modeling algorithm for airborne natural field source electromagnetic method, and provides a basis for the theoretical research of airborne natural field source electromagnetic method and the inversion interpretation of actual observation data, so as to enable airborne natural field source electromagnetic method to better serve the application fields such as mineral exploration and engineering exploration.

The invention belongs to the technical field of magnetic sensors, and discloses an angle sensor device based on a huge anisotropic conductance effect and a preparation method thereof, the angle sensor device is formed by combining a substrate, a bismuth palladium nanosheet, a Hall strip channel structure, a gold film metal electrode and hexagonal-boron nitride; the preparation method of the angle sensor comprises the following steps: S1, cleaning the silicon / silicon oxide substrate; s2, bonding the palladium bismuthide nanosheet on the surface of the substrate; s3, manufacturing a Hall strip channel structure on the palladium bismuthide nanosheet; s4, evaporating a gold film metal electrode on the Hall strip channel structure; s5, covering and packaging the palladium bismuthide nanosheet, the Hall strip channel structure and the gold film metal electrode by using hexagonal-boron nitride; the problems that an existing angle sensor is low in sensitivity, poor in stability, insufficient in precision, large in measurement error and not beneficial to miniaturization and integration of equipment due to the large size in a low-temperature strong magnetic field are solved.

The invention relates to an anisotropic carbon fiber reinforced epoxy resin composite material and a preparation method thereof, and the carbon fiber reinforced epoxy resin composite material has good rigidity, toughness and anisotropic conductivity. Comprising an epoxy resin matrix material and short carbon fibers with nickel microneedles modified on the surface, wherein the short carbon fibers are distributed in the epoxy resin matrix material in an oriented manner; the mass percentage content of the short carbon fiber with the surface modified by the nickel microneedle relative to the epoxy resin matrix material is 0.1-20%. The anisotropic carbon fiber reinforced epoxy resin composite material contains the short carbon fibers with the surfaces modified by the nickel microneedles, and the short carbon fibers with the surfaces modified by the nickel microneedles not only can be uniformly dispersed in an epoxy resin matrix material, but also can be distributed in the epoxy resin matrix material in an oriented manner; therefore, a conductive path can be formed in the epoxy resin matrix material, and the epoxy resin matrix material has relatively high conductivity; and the strength, modulus and toughness of the composite material are improved.